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84 lines
2.2 KiB
84 lines
2.2 KiB
#include "cache.h" |
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#include "pack.h" |
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static const char show_index_usage[] = |
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"git show-index < <packed archive index>"; |
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|
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int main(int argc, char **argv) |
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{ |
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int i; |
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unsigned nr; |
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unsigned int version; |
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static unsigned int top_index[256]; |
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if (argc != 1) |
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usage(show_index_usage); |
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if (fread(top_index, 2 * 4, 1, stdin) != 1) |
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die("unable to read header"); |
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if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) { |
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version = ntohl(top_index[1]); |
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if (version < 2 || version > 2) |
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die("unknown index version"); |
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if (fread(top_index, 256 * 4, 1, stdin) != 1) |
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die("unable to read index"); |
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} else { |
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version = 1; |
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if (fread(&top_index[2], 254 * 4, 1, stdin) != 1) |
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die("unable to read index"); |
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} |
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nr = 0; |
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for (i = 0; i < 256; i++) { |
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unsigned n = ntohl(top_index[i]); |
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if (n < nr) |
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die("corrupt index file"); |
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nr = n; |
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} |
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if (version == 1) { |
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for (i = 0; i < nr; i++) { |
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unsigned int offset, entry[6]; |
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if (fread(entry, 4 + 20, 1, stdin) != 1) |
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die("unable to read entry %u/%u", i, nr); |
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offset = ntohl(entry[0]); |
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printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1))); |
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} |
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} else { |
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unsigned off64_nr = 0; |
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struct { |
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unsigned char sha1[20]; |
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uint32_t crc; |
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uint32_t off; |
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} *entries = xmalloc(nr * sizeof(entries[0])); |
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for (i = 0; i < nr; i++) |
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if (fread(entries[i].sha1, 20, 1, stdin) != 1) |
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die("unable to read sha1 %u/%u", i, nr); |
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for (i = 0; i < nr; i++) |
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if (fread(&entries[i].crc, 4, 1, stdin) != 1) |
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die("unable to read crc %u/%u", i, nr); |
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for (i = 0; i < nr; i++) |
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if (fread(&entries[i].off, 4, 1, stdin) != 1) |
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die("unable to read 32b offset %u/%u", i, nr); |
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for (i = 0; i < nr; i++) { |
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uint64_t offset; |
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uint32_t off = ntohl(entries[i].off); |
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if (!(off & 0x80000000)) { |
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offset = off; |
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} else { |
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uint32_t off64[2]; |
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if ((off & 0x7fffffff) != off64_nr) |
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die("inconsistent 64b offset index"); |
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if (fread(off64, 8, 1, stdin) != 1) |
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die("unable to read 64b offset %u", off64_nr); |
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offset = (((uint64_t)ntohl(off64[0])) << 32) | |
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ntohl(off64[1]); |
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off64_nr++; |
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} |
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printf("%" PRIuMAX " %s (%08"PRIx32")\n", |
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(uintmax_t) offset, |
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sha1_to_hex(entries[i].sha1), |
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ntohl(entries[i].crc)); |
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} |
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free(entries); |
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} |
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return 0; |
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}
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